I connected up the cooler after they had flushed the tranny. I am looking into getting /putting in a pan drain plug so that I can make a partial fluid change every 5th or 6th oil change.
I drive about 1200 miles/wk, and change every 3000 miles, and have used wally 10w-30 synthetic in my last 3 3800'*. My 89 Regency Brougham had 265,000 when I traded it on a 1995 Royale. The Royale was recently traded with 245,000 on this LSS. Because I change fluids regularly, all had orig eng/tranny..and ran excellent when traded. Both are still in use...the Regency is near 400k, and the Royale is now a local TAXI..
None of my 38'* have "burned" oil, and except for needing to replace the rear main seal on the Royale, haven't leaked either.
1999 Buick Regal LS
ZZP 2.5" SS 304 DP, GTP Cat Back , GMPP Handling Kit, poly links and midpoints, HIR 9012/9011 with upgraded relay harness, 5000k HID fogs , 12" Impala/MC brake upgrade, Mag cat 94106, Ported and Polished LIM